Mitsubishi Air Conditioner PURY-EP450YLM-A

(1) Remove the service panel. (See figure at right.).

(2) Remove the connector of the solenoid valve in trouble.

(3) Remove the solenoid valve coil.

1) The coils on the solenoid valves SVA, SVB, SVM1,SVM1b, SVM2, and SVM2b can be serviced through the inspection door.

SVC is accessible for replacement by removing the four mounting screws on the rear panel and removing the panel.

(if enough space is available on the back). (SVM1 is present only on the G1, GA1, and HA1 types, SVM2 on the GA1 and HA1 types,

and SVM1b and SVM2b on the HA1 type.);

(1) To check the inside of the control box, remove the two lock nuts on the control box cover.

1) Check the terminal connection of the power wire or of the transmission line.

(2) When the control board is replaced, the followings must be noted.

(1) Check that the board type is G1,GA1(HA1), or GB1(HB1).

(2) Check that the wire and the connector are properly connected.

It is not required to remove the two fixing screws on the control box when checking the inside.;

Note: Secure enough service space in the ceiling for welding operation, and conduct the work carefully. If required, dismount the unit from the ceiling, and conduct the work.

Sign off on the disassembling process

Remove the two lock nuts on the control box

Loosen the other two nuts on the control box

Remove the three fixing screws on the service panel

Remove the nine machine screws on the ceiling panel

1) For the pressure sensors PS1 and PS3, refer to 1. 1), 2).

(2) Remove the pressure sensor connector in trouble from the control board, and insulate the connector.

1) Liquid-side pressure sensor (CNP1).

2) Intermediate-part pressure sensor (CNP3).

(3) Attach a new pressure sensor to the place which is shown in the figure, and insert the connector to the control board.

When gas leaks from the pressure sensor, repair the leak, and follow the instructions above if required.;